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Oscillatoria vs Nostoc: Cell Wall Differences

The document discusses the differences between the cell walls of Archaebacteria, Cyanobacteria and other Eubacteria. Archaebacteria cell walls have four unique features, Cyanobacteria cell walls are similar to gram-negative bacteria but thicker, and Eubacteria cell walls contain peptidoglycan.

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Isabelle D. Segismundo
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49 views2 pages

Oscillatoria vs Nostoc: Cell Wall Differences

The document discusses the differences between the cell walls of Archaebacteria, Cyanobacteria and other Eubacteria. Archaebacteria cell walls have four unique features, Cyanobacteria cell walls are similar to gram-negative bacteria but thicker, and Eubacteria cell walls contain peptidoglycan.

Uploaded by

Isabelle D. Segismundo
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Segismundo, Isabelle D.

Bio 12 THVW

1. How did Oscillatoria derive its name?

Oscillatoria derived its name from the movement the bacteria makes; it oscillates
meaning its filaments can slide back and forth for movement. (Oscillatoria)

2. How can you differentiate Nostoc from Oscillatoria?

Filaments of Nostoc are composed of spherical or barrel shaped cells while in


Oscillatoria, filaments are composed of disk-shaped cells. The filaments of Nostoc are held
together by firm mucilage while the filaments of Oscillatoria have no true sheath, although
thin filaments may appear to encase them (Oscillatoria). In addition, Nostoc has
heterocysts which are found at the end or between the filaments and akinetes which are
usually found midway between the two heterocysts (Nostoc).

3. What are the differences between the cell walls of Archaebacteria, Cyanobacteria and
other Eubacteria? What biochemical properties do these differences impart to the
respective groups?

For Archaebacteria, their cell wall has 4 features which are l-glycerol, ether linkage,
isoprenoid chains and branching of side chain. (Archaea:Morphology). The four features
enable the Archaebacteria to have an effective barrier against chemicals, to maintain
chemical equilibrium.

Cyanobacteria has peptidoglycan in their cell wall and it has a structure similar to a
Gram negative bacteria; however it has a thicker peptidoglycan layer compared to other
Gram-negative staining bacteria (Hoiczyk & Hansel, 2000). This allows the cyanobacteria
to carry out photosynthesis.

The cell wall of Eubacteria has peptidoglycan which gives the Eubacteria a firm
rigid-like structure. (Chapter 4 Characteristics of Prokaryotic Cells)

References:

Archaea: Morphology. (n.d.). Retrieved January 17, 2017, from


http://www.ucmp.berkeley.edu/archaea/archaeamm.html

Chapter 4 Characteristics of Prokaryotic & Eukaryotic Cells. (n.d.). Retrieved January 18,
2017, from http://www.austincc.edu/rohde/CHP4.HTM

Hoiczyk, E., & Hansel, A. (2000). Cyanobacterial Cell Walls: News from an Unusual Prokaryotic
Envelope. Journal of Bacteriology, 182(5), 1191-1199. doi:10.1128/jb.182.5.1191-1199.2000

Oscillatoria. (n.d.). Retrieved January 17, 2017, from


http://fmp.conncoll.edu/Silicasecchidisk/LucidKeys3.5/Keys_v3.5/Carolina35_Key/Media/Html/O
scillatoria_Main.html
Nostoc. (n.d.). Retrieved January 17, 2017, from
http://fmp.conncoll.edu/Silicasecchidisk/LucidKeys3.5/Keys_v3.5/Carolina35_Key/Media/Html/N
ostoc_Main.html

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